Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cffee9ef0262e4…

MALICIOUS

PDF

45.6 KB Created: 2020-08-17 07:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d703cc8c2ffa8f7039a385ccc4f3274b SHA-1: 91d615f3730b21381282d127c11d177519304ea7 SHA-256: b2cffee9ef0262e42c37b6e8f64687f9b8cdd6bc13d3b8e3543253f60103d45a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=linking+stylesheet+to+html', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs hosted on Shopify, suggesting a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=linking+stylesheet+to+html
    • http://navaz.raisingwellness.org/uploads/1/3/0/9/130969204/pajubifidakifof.pdf
    • https://cdn.shopify.com/s/files/1/0436/5506/9849/files/cupcake_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0438/5102/2501/files/7219171752.pdf
    • https://cdn.shopify.com/s/files/1/0437/5475/0106/files/english_alphabet_cursive_writing.pdf
    • https://cdn.shopify.com/s/files/1/0436/5549/5833/files/70755860745.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/sepotobavenuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/jokifiparelekebo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/avg_pc_tuneup_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/8560/1693/files/gofidaxilab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/92905779056.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/how_to_cancel_adobe_creative_cloud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/14442740121.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c13.bin
2b6ffa726b3b8a5e80437bc7effa177a77286ac50af2a2e43e2b9dd223d8dc28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C13 4900 bytes
font_01_sfnt_off00007ca5.bin
955388e08d3f01b9bdbb4b0055f21649d2bcaec68e1f756c16e5985447bcdfea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA5 14040 bytes